Don't set up an advanced exchange, or any exchange really, though the web form on the Moto website. Your RMA will just stick in the system because they have no refurbished Pure's to send out so the automated RMA system just gets lost and nothing ever happens. That is pretty much what happened to mine.
Your best bet is to call or do an e-chat with an agent and get it set up to do an exchange and have them send you a code to order a new Moto X at not cost and send yours in. If you have any issues you can post on Motorola Support forums about the problem and usually one of the few agents that are on the forum can get it fixed up but there is no real guarantee on that front..